• 53% people receive 5-8 hrs direct sunlight, 28% people receive 2-5hrs direct sunlight, 12% people receive less than 2 hrs and 7% people do not receive sunlight at
all.
• 10% people use solar cooker while 90% people don't use it.
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GAUREE K. WATHODKAR*, P. T. AGRAWAL
U.G. Department of Chemistry, Shri R.L.T. College of Science, AKOLA-444001 (M.S.) INDIA
ABSTRACT- A local survey was made to find whether people are not using solar cooker because it is time consuming even after receiving enough sunlight. To decrease the time of cooking of solar cooker temperature of cooking box should be increased for that a greenhouse gas - CO2 is used. The easiest and economical way of producing CO2 - adding lemon juice to baking soda was used. To verify this fact a comparative study was done which concluded that the temperature can be increased. Also the expenditure for this was calculated which shows that use of this technique will be economical than using conventional way.
KEY WORDS:- solar cooker, temperature rising factor, greenhouse gas, CO2, lemon juice, baking soda, less expenditure.
—————————— ——————————
Conventional energy resources are limited and non- eco friendly. So, scientists invented many non-conventional energy devices. The non-conventional energy can be used in many ways but most of the people are not using it even after having energy crisis.
One of such non-conventional energy device is solar cooker and it is mainly ignored because it is time consuming and less efficient. For reducing the time taken by the solar cooker for cooking we have to increase the temperature of the cooking box of the solar cooker.
In order to increase the efficiency of solar cooker, this
effort is made so that more people will use it.
A local survey of 100 people was carried out from which it was observed that
• 53% people receive 5-8 hrs direct sunlight, 28% people receive 2-5hrs direct sunlight, 12% people receive less than 2 hrs and 7% people do not receive sunlight at
all.
• 10% people use solar cooker while 90% people don't use it.
People using solar cooker
People not using solar cooker
• 68.89% people do not use solar cooker because they think solar cooker is time-cosuming and 31.11% peo- ple don't use it due to some other reasons.
5 - 8 hrs
2 - 5 hrs upto 2 hrs
do not receive
*email id – gaukiwa@gmail.com
Time consuming
Other
2 identical chambers similar to cooking box of solar cooker, 2 thermometers, Baking soda, Lemon, stopwatch are
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used for this experiment.
Carbon dioxide (CO2 ) gas was introduced in cham-
bers similar to cooking box of solar cooker and it was kept in
sunlight along with a similar chamber without Carbon dioxide (CO2 ). Temperature of both of them was noted after every 15 minutes.
The solar cooker is a device which works on the prin- ciple of greenhouse effect. Green house gas is the temperature rising factor of the cooking box of solar cooker. But there the greenhouse gas present is water vapour (others are present in negligible amount).
The Carbon dioxide (CO2) is a green house gas i.e. it absorbs heat and re-radiates it, so the temperature of the at- mosphere increases.
Water vapour and CO2 both are green house gases but temperature rise due to CO2 is more than that of water vapour.
So, we introduced Carbon dioxide (CO2) gas in the cooking box of solar cooker, to increase the internal tempera- ture of cooking box.
The cheapest way of production of Carbon dioxide gas at domestic level is reacting Baking soda with lemon juice. The lemon juice contains citric acid which gives out CO2 when reacted with Sodium bicarbonate i.e. baking soda.
The reaction is as follows
DAY 2 - Temperature in degree celcius
Thus, the CO2 gas is evolved which shows green- house effect.
Two chambers similar to the cooking box of solar cooker were used, which have their five surfaces made of insu- lators and only one is made of plastic so that solar radiation can enter in the chamber but heat can’t exit from it. CO2 was introduced in one chamber and both chambers were kept in sunlight. It was noticed that the temperature of chamber with
CO2 is more than the other.
DAY 1 - Temperature in degree celcius
Time (min) | Box with- out CO2 | Box with CO2 |
0 | 21 | 21 |
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300 | 47 | 50 |
315 | 44 | 48 |
330 | 41 | 36 |
345 | 39 | 43 |
360 | 34 | 38 |
•DAY 3 - Temperature in degree celcius
Time (min) | Box without CO2 | Box with CO2 |
0 | 21 | 21 |
15 | 48 | 48 |
30 | 50 | 50 |
45 | 50 | 52 |
60 | 52 | 53 |
75 | 52 | 54 |
90 | 53 | 55 |
105 | 54 | 56 |
120 | 54 | 56 |
• For one day :- Baking soda + lemon = Rs. 5
• For 6 months :- Baking soda + lemon = Rs. 900
• Cost of Solar Cooker = Rs. 2000
• Total cost = Rs. (2000 + 5) = Rs. 2900
• Cost of 6 commercial cylinders = Rs. 5900
• Therefore, economically it is cheaper to use solar cooker with introduction of CO2 than using the LPG gas.
6. CONCLUSION
The temperature of cooking box of solar cooker can be in- creased by introducing CO2 in it. As the temperature increases the efficiency of solar cooker also increases.
[1].Development and performance testing of solar cookers - C Z M Kimambo - Journal of Energy in Southern Africa • Vol 18 No 3 • August
2007 (Page No. 41-51)
[2]. Case study: India Solar Cooker - http://iefworld.org/elcindiasolar.htm
[3].Principles of Solar Box Cooker Design
By Mark Aalfs, Solar Cookers International -
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